Arc-lamp electrode.



C. W. BAKE.

ARC LAMP ELECTRODE.

APPLICATION FILED APR.13,'1912.

1,105,887. Patented Aug. 4, 1914,

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WITNESSES: INVENTOI? 07 I0 I; ah

/ ATTORNEY UNITED STATES PATENT OFFICE CHARLES W. DAKE, OF CHICAGO, ILLINOIS, ASSIGNOR TO PYLE-NATIONAL ELECTRIC HEADLIGHT COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

ARC-LAMP ELECTRODE.

Application filed April 13, 1912.

To all whomit may concern:

Be it known that L'GHARLES W. DAKE, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have' invented a certain new and useful Improvement in -Arc -Lamp. Electrodes, of which the following is a specification.

My invention relates to electrodes for are lam s and has for its object to provide electro es having high fusing points or electrodes slow to. dis1ntegrate.

The invention is illustrated in the accompanying drawing, wherein- Figure 1 is an elevation with parts in vertical section of a pair of electrodes;

' 2, a detailed modification of the upper electrode; Fig. 3, a detail of'a further modification of the upper electrode.

Like parts are indicated by like figures in the drawings.

1 is the body of the upper electrode having a sheath 2 or a cap 2 or a plug 2"; 3 is thelower electrode.

In Fig. 1 I have shown the parts in position as if in use in an arc lamp, but I have not shown the mechanism. for starting the are or feeding or supporting either of the electrodes. The arrangements for supporting such carbons or manipulating them as may be required in an arc lamp form no part of this invention and, hence, I show nothing in that respect.

In Fig. 1 I have shown the two electrodes as immovable and connected through a battery. The upper electrode, being in this case the positive electrode, is made of any desired material but provided with a sheath, cap or plug which disintegrates slowly, if at all, or which has a high fusing point or which may have both of these characteristics. The lower electrode, i1 this case the negative, may be of any desired material, but

Specification of Letters latent.

I Patented Aug. 4, 1914. Serial No. 690,593.

preferably, of course, a material which slowly disintegra'tes, if at all, and which has a high fusing point, though in this case, of course, the requirements are much less severe.

In a preferred or convenient form of my device the lower electrode is made of copper and the upper of any desired material with a tungsten sheath, cap or plug. With such a combination of electrodes the are is fixed and uniform.

The'two parts of the upper electrode may be assembled or united in any desired manner, and materials other than tungsten may, of course, be used. I mention that as perhaps the desirable or the preferred sub stance to be employed;

By the term fusing of course I mean melting or any other similar change or transformation which would unfit the carbon for any reason to perform its accepted function. The arrangement which I have shown and described applies, of course, to direct current lamps. In the'case'of an alternating current it would be necessary to substitute for the lower or copper carbon another carbon with a high fusing point.

I claim An arc lamp comprising a pair of'metallic electrodes, one of them negative, the other positive, the positive electrode being provided with a metallic sheath on the end thereof in opposition to the end of the nega- CHARLES W. DAKE.

Witnesses:

FRANCIS W. PARKER, J r., MiNNIE I. SUNnFon; 

